Whirlpool MVWC400XW Technical Education page 74

If one or more DC voltages are still missing,

go to step 10.
10. Check if console UI is affecting the main
9. Check if shifter assembly is affecting the
control DC supplies.
main control DC supplies.
TROUBLESHOOTING GUIDE (continued)
a. Unplug washer or disconnect power.
a. Unplug washer or disconnect power.
b. Remove connector J9 from main control. FOR SERVICE TECHNICIANS ONLY
b. Remove connector J2 from main control.
c. Plug in washer or reconnect power.
c. Plug in washer or reconnect power.
WARNING
d. Recheck the DC voltages per steps 7 & 8.
d. Recheck the DC voltages per steps 7 & 8.
Perform voltage checks inside header J9 on the
If the DC voltages return, replace shifter assy.

board – do not short pins together .
If one or more DC voltages are still missing,

If the DC voltages return, replace console UI.

go to step 10.
If one or more DC voltages are still missing,

10. Check if console UI is affecting the main
go to step 11.
control DC supplies.
11. Main Control has malfunctioned.
a. Unplug washer or disconnect power.
Electrical Shock Hazard
a. Unplug washer or disconnect power.
b. Remove connector J9 from main control.
Disconnect power before servicing.
b. Replace the main control.
c. Plug in washer or reconnect power.
Replace all parts and panels before
c. Reassemble all parts and panels.
d. Recheck the DC voltages per steps 7 & 8.
operating.
d. Plug in washer or reconnect power. Calibrate
Perform voltage checks inside header J9 on the
washer and perform Automatic Test to verify repair.
Failure to do so can result in death or
board – do not short pins together .
electrical shock.
If the DC voltages return, replace console UI.

TEST #2: Valves
If one or more DC voltages are still missing,

TEST #2: Valves
This test checks the electrical connections
go to step 11.
This test checks the electrical connections
to the valves, and the valves themselves.
11. Main Control has malfunctioned.
to the valves, and the valves themselves.
1. Check the relays and electrical connections
a. Unplug washer or disconnect power.
1. Check the relays and electrical connections
to the valves by performing the Cold, Hot, Oxi,
b. Replace the main control.
to the valves by performing the Cold, Hot,
and Fabric Softener Valve tests under Manual
c. Reassemble all parts and panels.
Oxi, and Fabric Softener Valve tests under
Test Mode. Each test activates and
Manual Test Mode. Each test activates
d. Plug in washer or reconnect power. Calibrate
deactivates the selected valve. The following
and deactivates the selected valve. The
washer and perform Automatic Test to verify repair.
following steps assume one (or more)
steps assume one (or more) valve(s) did not
valve(s) did not turn on.
turn on.
TEST #2: Valves
2. For the valve(s) in question check the
2. For the valve(s) in question check the
individual solenoid valves:
This test checks the electrical connections
individual solenoid valves:
a. Unplug washer or disconnect power.
to the valves, and the valves themselves.
a. Unplug washer or disconnect power.
b. Remove console to access main control. 1. Check the relays and electrical connections
b. Remove console to access main control.
to the valves by performing the Cold, Hot, Oxi,
c. Remove connector J3 from main control.
c. Remove connector J3 from main control.
and Fabric Softener Valve tests under Manual
Refer to main control diagram on page 12.
Refer to main control diagram.
Test Mode. Each test activates and
d. Check harness connection to solenoid
d. Check harness connection to solenoid valves.
deactivates the selected valve. The following
valves.
3. Check resistance of the valve coils across
steps assume one (or more) valve(s) did not
3. Check resistance of the valve coils across
the following J3 connector pinouts:
turn on.
the following J3 connector pinouts:
2. For the valve(s) in question check the
V l a e v
individual solenoid valves:
H t o a V e v l
o C d l a V e v l
a. Unplug washer or disconnect power.
O i x a V e v l
b. Remove console to access main control.
Fabric Softener Valve
c. Remove connector J3 from main control.
Resistance should be between 890–1.3k Ω.
Refer to main control diagram.
If resistance readings are tens of ohms
d. Check harness connection to solenoid valves.
outside of range, replace the valve
3. Check resistance of the valve coils across
assembly.
the following J3 connector pinouts:
If resistance readings are within range,
replace main control and calibrate washer.
V l a e v
H t o a V e v l
o C d l a V e v l
O i x a V e v l
Fabric Softener Valve
TEST #3a: Drive System – Shifter
This test checks connections, shifter motor,
Resistance should be between 890–1.3k Ω .
switch, and optical sensor.
NOTE: Refer to Figure 4, "Shifter Assembly Strip

Circuit" on page 14 for tests and measurements.
IMPORTANT: Drain water from tub before

Perform automatic test to verify repair.
accessing bottom of washer.
TEST #3a: Drive System – Shifter
Functional Check:
This test checks connections, shifter motor,
1. Check the shifter and electrical connections
switch, and optical sensor.
TEST #3a: Drive System – Shifter
by performing both the Spin AND Agitate test
NOTE: Refer to Figure 4, "Shifter Assembly
This test checks connections, shifter motor,
under Manual Test Mode. The following
Strip Circuit" for tests and measurements.
switch, and optical sensor.
steps assume that this step was unsuccessful.
IMPORTANT: Drain water from tub before
NOTE: Refer to Figure 4, "Shifter Assembly Strip
2. Unplug washer or disconnect power.
accessing bottom of washer.
Circuit" on page 14 for tests and measurements.
3. Check to see if basket will turn freely.
Functional Check:
IMPORTANT: Drain water from tub before
If basket turns freely, go to step 4.

accessing bottom of washer.
1. Check the shifter and electrical connections
If basket does not turn freely, determine what
by performing both the Spin AND Agitate

Functional Check:
is causing the mechanical friction or lockup.
test under Manual Test Mode. The
following steps assume that this step was
1. Check the shifter and electrical connections
4. Remove console to access main control.
unsuccessful.
by performing both the Spin AND Agitate test
5. Visually check that the J2 and J16 connectors
2. Unplug washer or disconnect power.
under Manual Test Mode. The following
are inserted all the way into the main control.
steps assume that this step was unsuccessful.
3. Check to see if basket will turn freely.
If visual checks pass, go to step 6.

2. Unplug washer or disconnect power.
If basket turns freely, go to step 4.
If connectors are not inserted properly,

3. Check to see if basket will turn freely.
reconnect J2 and J16 and repeat step 1.
If basket does not turn freely, determine
what is causing the mechanical friction or

Shifter Motor:
lockup.

6. e R m
4. Remove console to access main control.
With an ohmmeter, verify resistance values shown
5. Visually check that the J2 and J16
4. Remove console to access main control.
below across the following J16 connector pinouts:
connectors are inserted all the way into the
5. Visually check that the J2 and J16 connectors
main control.
Component
are inserted all the way into the main control.
Shifter Motor
If visual checks pass, go to step 6.

Resistance should be between 2k to 3.5k Ω .
If connectors are not inserted properly,

If values are correct, reconnect J16 and reconnect J2 and J16 and repeat step 1.

proceed to step 7.
Shifter Motor:
If values are open or out of range, Shifter Motor:

6. Remove connector J16 from main control.
go to step 13.
6.
With an ohmmeter, verify resistance
values shown below across the following
With an ohmmeter, verify resistance values shown
7. Plug in washer or reconnect power.
J16 connector pinouts:
below across the following J16 connector pinouts:
8. With a voltmeter set to AC, connect the
black probe to J16-2 (N) and red probe to
Component
i P o n t u
Shifter Motor
J16-1 (L1). Activate shifter motor by switching
3 J 1 , & 4
3 J 1 , & 5
between Spin and Agitate modes. Energize
Resistance should be between 2k to 3.5k Ω .
3 J 1 , & 6
outputs using Manual Test Mode.

J3, 1 & 7

7. Plug in washer or reconnect power.
8. With a voltmeter set to AC, connect the
black probe to J16-2 (N) and red probe to
i P o n t u
J16-1 (L1). Activate shifter motor by switching
3 J 1 , & 4
6-7
3 J 1 , & 5
between Spin and Agitate modes. Energize
3 J 1 , & 6
outputs using Manual Test Mode.
J3, 1 & 7
If resistance readings are tens of ohms
outside of range, replace the valve assembly.
If resistance readings are within range,
replace main control and calibrate washer.
Perform automatic test to verify repair.
If basket turns freely, go to step 4.
If basket does not turn freely, determine what
o e v o c n n c e o t J r 6 1 o r f
is causing the mechanical friction or lockup.
J16 Connector Pinout
If visual checks pass, go to step 6.
If connectors are not inserted properly,
reconnect J2 and J16 and repeat step 1.
e R m o e v o c n n c e o t J r 6 1
If values are correct, reconnect J16 and
proceed to step 7.
If values are open or out of range,
go to step 13.
m m a n i o c r t n . l o
J16, 1 & 2
o r f m m a n i o c r t n . l o
J16 Connector Pinout
J16, 1 & 2